Wiring Transmission Cables; Connecting A Transmission Booster; Name, Code And Possible Unit Connections; Types Of Control Cables - Mitsubishi Electric CITY MULTI PUHY-YMC Installation Manual

11.3. Wiring transmission cables

Wiring method, address setting method and permissible wiring length differ according to and whether or not you are using transmission booster. Check
permissible wiring length before wiring.
A may be required depending on the number of indoor units.
Item 4 "Wiring examples" gives typical wiring examples (a-c).
a. System using remote controller (1 outdoor unit)
b. System using remote controller (system operated as a group among multiple refrigerant systems)
c. System using power supply extension unit for transmission booster (combination of systems a-b)

1 Connecting a transmission booster

A transmission booster (RP) is required when the number of connected indoor unit models in a cooling system exceeds the number of models specified
in the chart below.
* The maximum number of units that can be controlled is determined by the indoor unit model, the type of remote controller and their capabilities.
(*1)
Capability of the
connected indoor units
*1 If even one unit that is higher than 200 exists in the cooling system, the maximum capacity will be "200 or higher".

2 Name, code and possible unit connections

Name
Variable capacity unit controller
Outdoor unit
Constant capacity unit controller
Indoor unit Indoor unit controller
Remote controller Remote controller (*1)
Transmission booster unit
Other
*1 A transmission booster (RP) may be required depending on the number of connected indoor unit controllers.

3 Types of control cables

(1) Wiring transmission cables
• Types of transmission cables
Shielding wire CVVS or CPEVS
• Cable diameter
More than 1.25 mm 2
• Maximum wiring length within 200 m
(2) Remote control cables
Kind of remote control cable
Cable diameter
Remarks
4 Wiring examples
Typical wiring examples are shown on pages 28 to 32 . (Wiring examples A ~ C)
Remote controller type
Number of connected indoor units that can be
connected without a RP.
200 or lower
200 or higher
The number of indoor units and the total number of remote controllers is displayed within the parenthesis ( ).
Code
OC
OS
IC
RC
RP
2-core cable (unshielded)
2
0.5 to 0.75 mm
When 10 m is exceeded, use cable with the same
specifications as (1) Transmission line wiring.
Prior to Ver. E
Possible unit connections
–
1 unit per 1 OC.
2 to 32 units per 1 OC (*1).
2 units maximum per group.
0 to 1 unit per 1 OC (*1).
Remote controller PAR-F 25MA
After Ver. F
16 (32) 20 (40)
16 (32) 16 (32)
27